John Cowan was an American physician and phrenologist who wrote on sexual health, women's rights, and the evils of tobacco.
His 1869 manual for married couples, The Science of a New Life, was endorsed by the suffragist Elizabeth Cady Stanton. [2] It was issued in many editions, with parts of the original text expurgated to suit prevailing morality, such as his advice about contraception. It was re-issued with the new title of What All Married People Should Know in 1903. [3] In his 1870 book, Self-help in the Attainment of Perfection of Character and Success in Life, he described himself as a "practical phrenologist". [4]